Waterproof canopies include practical rain security, including welded seams, guttering

https://www.scribd.com/document/1053732647/Engineered-Ramadas-Arizona-Wind-and-Seismic-Factors-To-Consider-191183

Water resistant canopies add practical rain security, including welded seams, guttering, and downspouts that direct runoff securely away from pathways and seating.